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Vulnerabilities CVE-2026-15927

CVE-2026-15927

Medium
Open
TLP:CLEAR

Quay: mirror-registry: ssrf: repo-level mirror accepts external_reference without url validation

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Description

A flaw was found in Red Hat Quay's repository-level mirror configuration feature. The POST and PUT handlers in endpoints/api/mirror.py accept an external_reference parameter without SSRF validation, unlike the organization-level mirror handlers which apply validate_external_registry_url(). A repository administrator can supply a crafted hostname that causes the Quay mirror worker to make requests via Skopeo to internal network services, cloud metadata endpoints, or other resources not intended to be reachable from the Quay application.

Details

CVSS Score
6.8
EPSS Score
0.26%

18.2th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Confidence
90%
Published
Jul 21, 2026
Last Modified
Aug 12, 2026
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